Abstract: In a thermal equalization system a machine tool carriage preferably of aluminum but which could be made of other lightweight materials, a drilling spindle housing is mounted on the carriage. At least one spindle housing is be mounted said carriage to service work pieces mounted on a tooling plate of the work table for said spindle. The chiller unit is used to provide coolant to the spindle to compensate for the heat generated by the spindle during drilling. When the spindle is not drilling, excessive cooling of the spindle can result. Accordingly, the instant invention also includes, a conductive rubber heating pad which is attached to the spindle structure to provide a heat source for the system to compensate for excessive cooling when the drill is not generating heat. The temperature control maintains the temperature between the spindle housing, carriage and work table thereby minimizing temperature expansion differentials between the drilling position and the worktable position.

Abstract: The invention relates to a method of cooling and lubricating a metal-cutting rotating tool with a geometrically defined cutting element and/or the workpiece in the cutting zone. A coolant-lubricant and a carrier gas are fed separately into a tool shaft, brought together inside the rotating working spindle as close as possible to the cutting zone and directed via integral feed ducts onto the cutting element and/or cutting zone. Also disclosed is a device for applying this method. The coolant-lubricant and carrier gas are each introduced into a coolant reservoir completely or partially filled with a porous filler where they are mixed; the mixture is then fed directly into the cutting zone.

Abstract: A cooled magnetic chuck or cooled magnetic adapter for use with a magnetic chuck. Coolant passages are formed in a magnetic chuck, or in a cooled magnetic adapter for transmitting the magnetic forces of a magnetic chuck to a work piece, such that the heat generated in the workpiece by engagement with a material removing tool may be conducted away from the workpiece. The coolant passages are arranged such that a coolant fluid engages the magnetic materials of the magnetic chuck or adapter, portions of which magnetic material also engage the workpiece.

Abstract: A machine tool assembly, and particularly a spindle unit therefor, is provided wherein the spindle unit is relatively small and is designed to run at rotary speeds of between 30,000 rpm's and 40,000 rpm's utilizing hydrodynamic bearings for the spindle shaft. The hydrodynamic bearings are effective to take increased loads versus similarly sized conventional metal-to-metal contacting bearings to provide a very stiff machining system even with the higher loads generated by the increased rotary operating speeds for high speed machining contemplated for the spindle unit herein. The bearings are also designed to use a water-based fluid which is compatible with the cutting fluid. Non-contacting fluid barrier seals limit and control the amount of bearing fluid leaked to the cutting fluid. Due to the compatible nature of the two fluids, small fluid leakage from the bearings will not hurt the cutting fluid. The cutting fluid circulated at an ambient inlet temperature, e.g., 70.degree. F.

Abstract: In a machine tool having a main shaft, a thermal change amount between two sampling times is computed on the basis of the movement distance of the main shaft during a period from time 0 to time 1a. After thermal change amounts are computed, a total thermal change amount which results from adding these thermal change amounts is computed. Since the thermal change amount is based on the movement distances (driving states) that are detected at the respective time points and the influence of the thermal change amounts that has been computed previously are added to the computed thermal change amount, it is possible to compute the total thermal change amount corresponding to the driving states at the respective time points.

Abstract: In a laser-assisted milling process at least one laser beam is directed onto the workpiece immediately upstream of the milling tool so as to heat at least one zone of the workpiece parallel to the cutting profile produced by the milling tool, and the laser beam is moved longitudinally over the workpiece in the same direction and at the rate of advance as the milling tool is moved longitudinally over the workpiece. The heated zone may be disposed immediately upstream of either or both of the points at which the cutting edge of the tool enters and exits the cutting zone of the workpiece, or it may be a zone parallel to the cutting profile and of a width equal to that of the cutting zone.

Abstract: A tool unit according to the invention has an arrangement wherein a shaft-like mount portion having a step is disposed on one of a tool body or a tool holder. The other of the tool body or the tool holder, includes a recessed fitting portion or bore shrinkage-fitted on the mount portion and having a step. The fitting portion includes a hydraulic feed passage for externally feeding a high-pressure oil to a gap defined between the step of the mount portion and the step of the fitting portion. In mounting the tool body to the tool holder, the high-pressure oil is externally fed to the gap through the hydraulic feed passage. Thus, a thin layer of the high-pressure oil is formed between the shrinkage-fitted surfaces, while on the other hand, the tool body and the tool holder are drawn close to each other. This facilitates the correction of inclination or axial displacement of the fitting portion relative to the mount portion, which occurred during the shrinkage-fit process.

Abstract: There is provided a method for estimating the thermal displacement of a component of a machine tool comprising the steps of detecting the temperature of at lease one rotatable component of a machine tool having a variable rotational speed and a variable temperature; converting the detected temperature into a numerical value; and estimating the thermal displacement of the component based on the numerical value using an operational expression which includes a time-varying coefficient.

Abstract: A quill stop for a milling machine, drill press, or other like machine. The quill stop includes means for automatic control of coolant flow. The quill stop includes a passage through which high pressure air flows. A valve in the passage controls the air flow. The valve is activated by contact of the quill stop with a dog stop on the machine. The quill stop may also include a self contained mist unit activated by the valve.

Abstract: A thermal displacement correcting apparatus suitable for a machine tool (1) provided with a mechanism for feeding a main spindle (2) is disclosed.

Abstract: A turn broaching machine for broaching a workpiece comprises a hollow arbor having a plurality of axially spaced apart, circumferentially extending cutting segments projecting radially outwardly from the side wall thereof. The cutting segments each have a radially outer peripheral edge provided with broaching elements. A closed loop system circulates a heated fluid through the arbor. The fluid is heated to an elevated temperature of about 100 F.-150 F. to maintain the arbor in a similarly heated condition during broaching. Maintaining the arbor at a relatively constant, elevated temperature during broaching stabilizes the broach by eliminating axial thermal expansion.

Abstract: Fluid dispensing and control system for tapping attachments includes a controller mountable upon a machining center and connectable between the tapping attachment and a source of cutting fluid, as well as to the machine's recirculating coolant flow. Connection of the tapping attachment to the machine through the controller determines whether cutting fluid or coolant will circulate to the tapping attachment.

Abstract: Motor spindle cooled by coolant for a machine tool comprising a workpiece spindle and a drive motor having a rotor surrounding the workpiece spindle, concentric with the workpiece spindle and connected to the workpiece spindle, and a stator surrounding the rotor and concentric with the rotor, and comprising a spindle housing accommodating the drive motor and coolant channels surrounding the stator, at least one inner coolant channel enclosing the stator at least to a major extent and at least one outer coolant channel similarly enclosing the stator at least to a major extent being provided--in section through the three-phase motor perpendicularly to the spindle axis--for decoupling the spindle housing thermally from the drive motor, the outer coolant channel lying--in relation to the spindle axis--outside the inner coolant channel in the radial direction, and a coolant inlet being connected to a first end of the outer coolant channel, the second end of the outer coolant channel to a first end of the inner coo

Abstract: A machine tool comprises at least one revolvable spindle having an end for supporting a work piece, a first processing tool disposed opposite to the end of the spindle for processing the work piece, a second processing tool disposed parallel to the first processing tool, and a revolving unit for revolving the spindle about a central revolving axis to place the end of the spindle opposite to the second processing tool for processing the work piece. A chamber is disposed on the outer peripheral surface of the work spindle. A pair of inlet and outlet connections are revolved integrally with the work spindle and are arranged on opposite sides of the central revolving axis. Connecting pipes connect the inlet and outlet connection on one side of the central revolving axis to the inlet and outlet connection at the opposite side of the central revolving axis through the chamber. A coolant supply pipe is provided for supplying a coolant to the chamber through the inlet and outlet connections and the connecting pipes.

Abstract: A generating head assembly for cutting or machining a surface on a workpiece and including a generating head mounted for relative rotation with the workpiece and with cutting or machining members having a radially advanced cutting or machining position for cutting or machining the surface of the workpiece and a radially retracted non-cutting on non-machining position; the generating head assembly includes an actuating structure for providing relative rotation between the generating head and the workpiece and a rotary motor mounted with the generating head; the rotary motor is selectively operable to rotate an actuating shaft relative to the generating head to actuate the cutting or machining members to their radially advanced and retracted positions without axial thrust loads being applied to the generating head.

Abstract: A method for reducing wear of ceramic cutting components during machining operations in which surface material is removed from a workpiece with reduced friction and with improved surface finish imparted to the reshaped workpiece. The method uses of cutting fluid compositions containing monomers capable of forming polymers in situ when subjected to tribological conditions (such as high temperature, pressure, and friction) existing at the contact area developed between the ceramic tool and surface of the workpiece during machining.

Abstract: A controlled atmosphere machining process which involves a work station for machining a workpiece with an inert gas in an enclosed environment which will not support combustion. The process further includes a vacuum system which removes particulate matter occurring during the machining process and transports the matter to a collecting tank. The inert fluid is recycled through a filter and cooling system and continues to be drawn by the vacuum system into the enclosed machining area of each work station.

Abstract: A temperature change of a machine tool which is influenced by a heat generating source is detected by a temperature sensor. A temperature change having substantially the same time constant as a time constant of a thermal distortion of the machine tool is calculated by using the detected temperature change. A machining error is corrected on the basis of the thermal distortion corresponding to the calculated temperature change. According to a method and an apparatus for compensating for the thermal distortion in the machine tool, it is possible to perform the compensation relative to the thermal distortion with high precision. The invention is applied to a machine tool such as a machining center and an NC lathe.

Abstract: Apparatus capable of performing wet and dry machining processes such as a hobbing machine for producing spur and helical gears, shafts, splines, and the like, by wet and dry hobbing methods. The apparatus comprises means to remove metal chips resulting from the wet and dry machining processes from the apparatus via respective independent wet and dry chip outlets. The chip removal means comprises a transfer means located in the machine base with the transfer means being reversible in direction in order to convey metal chips, emanating from the machining process, to the respective wet or dry chip outlet. The chip removal means enables metal chips from wet machining processes to be conveyed to and discharged from an outlet in one side surface and metal chips from dry machining processes to be conveyed to and discharged from an outlet in another side surface.

Abstract: A machine tool comprises a spindle head (2) having a vertical bore (2a); a spindle (20) provided in said vertical bore (2a) and including a tapered hole (24) at the lower end of said spindle (20); bearing means (22a) provided in said vertical bore (2a) for rotatably supporting said spindle (20); a non-contact sealing means (10a) for sealing the bearing means (22a). The machine tool further comprises a device for preventing a cutting fluid from entering the bearing for the spindle. The device comprises means (6a, 6b) for forming a pressure chamber (6) provided so as to enclose the non-contact sealing means (10a); and means (44) for supplying air to the pressure chamber (6).

Abstract: The bearing of a machine tool spindle is sealed by a pair of wiping seals mounted on the shaft and resiliently urged into contact with opposite faces of a stationary ring through which the shaft extends. The very small clearance between the ring and the shaft is fed with gas for example air at low pressure. When there is no gas supply and for example when the shaft is stationary the seals contact the ring and the resilience ensures good contact and prevents seepage of for example lubricant along the shaft from one side of the seals to the other. When the shaft is to be driven, low pressure gas is supplied and this pressure deflects the seals to lift them from the face of the ring so that there is no frictional engagement and either power loss or heat generation, and any liquid which does go past the seals is thrown outwardly by centrifugal force and driven by the escaping gas.

Abstract: In construction of a tool holder used for boring or tapping by vibratory rotation of a tool such as a cutter, rotation is transmitted to the tool by a rotary holder in a casing and vibration is transmitted to the tool by a vibration piece eccentrically coupled to a drive shaft. An outer oil reservoir is formed between the rotary holder and the casing whereas an inner oil reservoir is formed between the rotary holder and the vibration piece. A pump unit is arranged within the first oil conduit for communicating the two oil reservoirs so as to allow flow of oil from the inner oil reservoir to the outer oil reservoir only when the vibration piece performs a composite movement. The second oil conduit is formed in the vibration piece in order introduce oil in the outer oil reservoir into a space present at the joint of the vibration piece to the drive shaft.

Abstract: A compensation system for a computer-controlled machining apparatus having a controller and including a cutting tool and a workpiece holder which are movable relative to one another along preprogrammed path during a machining operation utilizes sensors for gathering information at a preselected stage of a machining operation relating to an actual condition. The controller compares the actual condition to a condition which the program presumes to exist at the preselected stage and alters the program in accordance with detected variations between the actual condition and the assumed condition. Such conditions may be related to process parameters, such as a position, dimension or shape of the cutting tool or workpiece or an environmental temperature associated with the machining operation, and such sensors may be a contact or a non-contact type of sensor or a temperature transducer.

Abstract: In summary, therefore, this invention is directed to a thermal growth detector and compensator for detecting and compensating for relative movement between a work holder of a machine tool and a tool holder, that includes an elongated rod made of a material having a coefficient of thermal expansion of substantially zero that is attached at one end thereof to a part of a machine tool, and is attached at another end thereof to a part of a work holder on the machine tool.

Abstract: The spindle and the bearings for the spindle in a milling, boring or other machine are cooled by streams of air which is drawn from the surrounding atmosphere by one or more turbine wheels. The turbine wheel or wheels are rotated by the spindle or by a pulley which drives the spindle, and the air streams are caused to withdraw heat from one or more tubes which are adjacent and/or surround the bearings for the spindle. The feature that the turbine wheel or wheels are driven at a speed which is proportional to the RPM of the spindle ensures that the cooling action is also proportional to such speed.

Abstract: A cushion layer 92 made of plastics or rubber is fixed on a stamp body 90, on which a peelable layer 94 having a certain thickness and formed by a rubber having a glass-transition temperature higher than -50 degrees Celsius, is temporarily fixed, and further, a protective film 96 is temporarily fixed on the peelable layer 94. Next, to form an image section, the peelable layer 94 is cooled to a temperature below its glass-transition temperature, the peelable layer 94 and protective film 96 being cut along a boundary line 116 between the engraving region on which images on the peelable layer 94 are engraved and the blank region other than the engraving region, and the area other than the image on the engraving region being cut and removed so deep that the peelable layer will not be cut.

Abstract: A hand held power dowel tool includes a high speed universal motor coupled to a relatively simple two-gear transmission. The motor speed gear reduction combination is specifically designed for 1/4 inch and 3/8 inch drilling of wood, making the tool unusually lightweight for the power it delivers. The tool's drive shaft is especially long and well supported to rigidly hold a conventional drill bit without a need for a drill guide bushing. A smooth acting guide assembly aligns the tool to the board and accurately guides the drill bit to a preset depth. The tool also includes an adjustable viewing window that is kept clear by a stream of air discharged by the tool's cooling system. The adjustable viewing window and an adjustable chuck accommodates wood of various width and thicknesses as well as various dowel peg diameters. The tool's range of wood joining capabilities surpasses today's plate joiners.

Abstract: A headstock cooling system for a machine tool comprising a base having a top, bottom and a first fluid passageway extending centrally therethrough from the top to the bottom. A bed is mounted on the base top and provided with a second fluid passageway extending coaxially from the first fluid passageway and in fluid communication therewith. A headstock is mounted on the bed and is positioned coaxial with and directly above the second fluid passageway and includes means for communication with the second fluid passageway for directing a cooling fluid from the second fluid passageway out of the headstock thereby cooling the headstock over at least a substantial portion of the headstock.

Abstract: A spindle of a machine center is held in a spindle sleeve directly straightly driven by a servo-controlled motor aligned with the spindle axis for preventing any bending or twisting caused to the rotating spindle during cutting operation and having a plurality of longitudinal cooling passages parallelly longitudinally formed in the spindle sleeve proximate to an upper and a lower bearings disposed around the spindle for enhancing the cooling effect of the running spindle, and having a direct application of cooling oil mist or gas stream into the bearing systems of the spindle to greatly minimize any frictional heat or temperature raise caused from the running spindle to prevent a thermal expansion influencing the processing precision of the cutting operation.

Abstract: A high speed spindle is provided which includes a rotor driven by an electric motor and provided with tapered journals received in tapered rubber bearings. Lubricating water flows to the bearings through metered openings in the journals, flowing from the openings through reverse spiral grooves in the journals which have diminishing cross section. The water flowing through the rotor also cools the rotor, as well as the collet driven by the rotor and a tool held by the collet. Rubber seals around the rotor shaft wear to a zero clearance during run-in for confining the water that exhausts from the bearings. Compressed air is introduced into the spindle to cooperate with the seals in preventing water leakage. The compressed air also reacts against a bladder that is arranged to impose an end load on one of the bearings, which is movable, to urge the bearing toward its journal. The force is varied to increase the bearing end load as rotor speed increases.

Abstract: A high speed machining system (10) including a machine tool (16) mounted on a hollow shaft (14) rotatable at high speeds and the tool (16) being operable at high feed rates. Liquid cutting coolant (22) flows to the tool (16) through the hollow shaft (14) to flush away debris from the tool (16) and for cooling the system (10). Drive means (18) including windings rotate the shaft (14), which is supported by bearings. The windings and bearings have the characteristic of long life in an environment free of liquid cutting coolant (22). The high speed machining system (10) includes a seal assembly (30) to prevent the liquid (22) from entering the liquid-free environment of the bearings and the windings. The seal assembly (30) includes annular means for urging (52) a stationary sealing face (42) against and in annular contact with a rotating hardened sealing surface (38) to form an annular primary seal (54) for isolating the liquid (22 ) from the bearings and windings.

Abstract: A traction drive tool adapter, has a rotary portion provided at its front half section with planetary roller-inserting bores extending radially from the outer circumferential surface of the rotary portion into a central bore therein, each of the roller-inserting bores having planetary rollers driving shaft member-setting grooves continuing from two ends of the roller-inserting bore that are opposed to each other in the axial direction of the central bore.

Abstract: A machine tool has a bed (1), a table (2), a column (3), a spindle head (4) movable along the column (3), a spindle (12) rotatably supported by the spindle head (4). The machine tool also has in the spindle head (4) a double structure having an inner wall (21), an outer wall (20) and an oil space formed between them. A cooling oil (22) through the oil space so as to cool the spindle head (4).

Abstract: A machining system includes at least one machine tool (10) having at least one powered spindle (12) and a plurality of tools (14A-14F) stored in a magazine (40) for automatic retrieval and return by the spindle (12). A portable fixture assembly (16A, 16B, 16C) is employed in conjunction with the machine tool (10) and the tool magazine (40) for holding a workpiece (WP) during machining by the machine tool (10). The fixture assembly (16A, 16B, 16C) includes a plurality of clamping cylinders (70, 72, 80) and a plurality of clamping assemblies (84, 86) which are actuated either by the rotational torque supplied by spindle (12) or by the coolant fluid obtained from the spindle (12).

Abstract: A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, said lubricating composition comprising;(A) 5 to 88% by weight of at least one oil selected from the group consisting of a mineral oil and a synthetic oil,(B) 2 to 50% by weight of a reaction product of a long chain dibasic acid having 14 to 28 carbon atoms and an alkanolamine,(C) 5 to 30% by weight of at least one extreme pressure additive selected from the group consisting of sulfurized fat and oil, a phosphate, a phosphite, and an amine salt of phosphate or phosphite(D) 5 to 30% by weight of an emulsifying agent selected from the group consisting of an anionic s

Abstract: An intelligent Tool System used with Computer Numerical Controlled machining centers consisting of a method of establishing tool presence and type of tooling device and a method of eliminating any error due to thermal growth.The spindle mechanism provides CNC Communicating and Operating means with spindle mounted devices for establishing tool presence and type of tooling for eliminating error due to thermal growth and for determining the function of tooling devices such as telescoping tool holders for determining work surface location with random length tools and for sensing tool condition; automatic boring tools for high precision boring and contouring; probing devices for work surface location, measurement and definition; combination boring and probing tools for boring and measuring a hole without removing the tool from the spindle.

Abstract: A machining center, particularly adapted for automated turning of workpieces, includes a headstock with one or more rotatably mounted spindles located in spaced generally horizontal alignment with drive means connected to rotate the spindles independently of each other as necessary. Automatic chucks or collets are mounted on and driven by each spindle. A bed supporting a power-driven cross slide extends across the axis of the spindle and at one end substantially beyond, in an offset T configuration, defining one or more machining areas between the chucks and one end of the bed. A ram carrying one or more tools, and mounted on the slide parallel to the spindle axes, faces into the machining area. A ram drive moves it toward and away from the chuck to maneuver a tool with respect to workpieces.

Abstract: A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubrication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, the ratio of water to said lubricating oil composition being at least 3 to 1,said lubricating oil composition comprising:(A) 10 to 90% by weight of at least one oil selected from the group consisting of a mineral oil and a synthetic oil,(B) 0 to 30% by weight of at least one extreme pressure additive selected from the group consisting of sulfurized fat and oil, a phosphate, a phosphite, and an amine salt of phosphate or phosphite and(C) 10 to 60% by weight of an emulsifying agent selected from the group consisting of an anionic surface active agent, a cationic sur

Abstract: A device for the temperature-responsive adjustment of the measuring points of two relatively movable machine tool parts, the device comprising a rule mounted for limited movement on a first machine part, a scanning head mounted on the second machine part, and at least one transverse rod which is disposed for axial movement in a portion of the movable machine part that is particularly subject to being heated. The transverse rod, which extends right into the heated zones at least with its inner end portion, has its outer end connected to the rule by means of a reversing drive such that elongations of the transverse rod caused by heating are converted to a horizontal shifting movement of the rule. In an alternative embodiment, a bimetallic element performs the function of the transverse rod.

Abstract: A high speed toolholder for driving a small high speed cutting tool from the large slow speed spindle of a machining center comprises a housing having a retention pin extending from side end thereof. An input shaft, dimensioned to be received in the machining center spindle, is rotatably journaled into the toolholder housing parallel to the retention pin. Rotatably journaled into the opposite side of the housing so as to be coaxial with the input shaft is an output shaft whose distal end has a tapered bore therein dimensioned to receive the shank of a high speed cutting tool. Within the housing, each of the input and output shaft carry a separate one of a pair of sheaves which are each lined by a V-belt to a separate one of a pair of sheave members on a step sheave rotatably journaled in the housing parallel to the input and output shaft.

Abstract: The machine tool comprises a vertical post (14) on which a head changer (19) is mounted for changing the tool head (17) provided at a head carrier (16). The head changer (19) is rotatable about a vertical axis. It carries at least one head gripper (22) which is adapted to grip from the top the tool head (17) and to rotate it from a front working position to a rear changing position. The post (14) being nonrotational (about any axis) and preferably unadjustable in height (the Y axis), is simple and low cost. The machine tool is readily adaptable to sophisticated design modifications, particularly including tool exchange in plural multi-tool tool heads and interchange with tool and/or tool head storage magazines.

Abstract: A crankshaft milling or a similar milling machine has been provided with a measuring pick-up which measures heat expansion of the clamping vises and of the milling drums for providing a correction value which is then supplied to the feed advance drives for the respective milling units to compensate for such heat expansions for accurate milling operations.

Abstract: A motor-incorporated spindle head unit is provided with a rotatable spindle on which a rotor assembly of the drive motor is fixedly mounted. A stator assembly of the drive motor is arranged around the rotor assembly and is fixed to a housing of the spindle head unit. A heat insulating system for preventing heat transfer from the stator assembly of the drive motor to the spindle as well as the bearings supporting the spindle is arranged between the drive motor and the front part of the spindle. The heat insulating system uses the flow of air for forming a heat insulator during the operation of the spindle head unit. A cooling system for cooling the stator assembly of the drive motor is also incorporated in the housing of the spindle head unit.

Abstract: In known deep-hole drilling machines, the undesirable situation arises, in the case of large drilling depths, that the boring bar, which becomes increasingly softer with increasing drilling depth, sags and starts to vibrate, so that the boring bar must be supported. This should, however, be possible at suitable spacings in the simplest possible manner and without interrupting the working process. For this purpose, it is envisaged that at least one guide bush for supporting the boring bar in a workpiece bore is provided on the boring bar, the guide bush being associated in a coaxial arrangement with a clamping ring of a ringe thickness which makes self-jamming tilting on the boring bar possible, and which clamping ring is pivotally coupled at one peripheral point to the guide bush to permit a small radial movement and has an external diameter smaller than that of the guide bush, and that at least one disengageable stopping device for a guide bush is provided within the coolant feed device.

Abstract: A motor-incorporated spindle head unit is provided with a rotatable spindle on which a rotor assembly of the motor is fixedly mounted. A stator assembly is arranged around the rotor assembly and is fixed to an outer framework of the spindle head unit in a cantilever fashion. A cooling system for cooling the stator assembly is formed by providing an annular gap between the outer framework and the periphery of the stator assembly and is adapted to permit cooling air introduced into the annular gap through air ports formed in an end of the outer framework to flow through at least a throughbore formed in the stator assembly.

Abstract: Disclosed herein is a gear cutter that comprises a bedplate, a first block or column mounted on the bedplate, designed to carry a tool, and a second block or column also mounted on the bedplate, designed to carry in an axis of rotation a piece to be cut, and wherein provision is made for a device for detecting variations, due to the thermal expansion of the bedplate, in the distance the first block is apart from the second block, and for drive means interlocked to the said detection device and connected to at least one of the said blocks in order to compensate continuously for variations in the spacing in between the said blocks.

Abstract: A method of and an arrangement for grinding gears, particularly bevel gears, includes grinding in a cooling lubricant bath in the cooling and lubricating medium to provide an increased grinding efficiency and cooler grinding without danger of grinding damage, and also guarantee self-cleaning of the grinding wheel since the cooling lubricant is always available in the grinding point.

Abstract: An adaptive control system for a machine tool or the like includes two pairs of thrust sensors for measuring radial and axial spindle deflection and a temperature sensor for measuring spindle bearing temperature. Data processing apparatus, typically comprised of a microcomputer, is coupled to the thrust and temperature sensors and regulates the spindle bearing preload and spindle axis feed rate in accordance with the radial and axial spindle thrust. The microcomputer simultaneously regulates the percentage of oil in the oil/air mixture lubrication mist sprayed on bearing contact surfaces in accordance with bearing temperature, thereby assuring optimum machine tool performance.

Abstract: A block assembly is adapted to be removably fixed to a vertically disposed way of a machine having systems for automatically supplying lubricating oil to the way and for supplying a dissimilar liquid coolant to a workpiece; the block assembly serving to collect lubricating oil flowing downwardly along the machine way and prevent its contaminating the coolant. The block assembly comprises a multi-sectional block shaped to provide an oil collection reservoir adapted to be placed in flow communication with a separate oil collection tank or sump.

Abstract: A double disc grinding machine comprising first and second stock removal assemblies, each including a wheelhead assembly including a base for slidably supporting the wheelhead assembly, a frame for supporting the first and second stock removal assemblies including front and rear walls, each having a vertically extending opening defined therein, a top portion above the opening and a bottom portion below the opening, one of the top portions having a tensile bolster for defining a first liquid container, the other one of the top portions also having a tensile bolster for defining a second liquid container, a reservoir including the bottom portions for defining a third liquid container, each of the containers having inlets and outlets, conduits for connecting the outlet ports of the third container to the inlet ports of the first and second containers and for connecting the outlet ports of the first and second containers and the inlet ports of the third container, the conduit including a fluid recirculating pump.